WO2017196155A2 - Procédé de transmission d'informations de commande pour une transmission must dans un système de communications sans fil, et appareil associé - Google Patents

Procédé de transmission d'informations de commande pour une transmission must dans un système de communications sans fil, et appareil associé Download PDF

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Publication number
WO2017196155A2
WO2017196155A2 PCT/KR2017/005015 KR2017005015W WO2017196155A2 WO 2017196155 A2 WO2017196155 A2 WO 2017196155A2 KR 2017005015 W KR2017005015 W KR 2017005015W WO 2017196155 A2 WO2017196155 A2 WO 2017196155A2
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Prior art keywords
interference
interference signal
signal
terminal
field
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English (en)
Korean (ko)
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WO2017196155A3 (fr
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김형태
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LG Electronics Inc
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LG Electronics Inc
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Priority to US16/094,868 priority Critical patent/US10993214B2/en
Priority to EP17796455.8A priority patent/EP3457597A4/fr
Publication of WO2017196155A2 publication Critical patent/WO2017196155A2/fr
Publication of WO2017196155A3 publication Critical patent/WO2017196155A3/fr
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
    • H04J11/004—Interference mitigation or co-ordination of multi-user interference at the receiver using regenerative subtractive interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3488—Multiresolution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and an apparatus for providing control information for MUST (Mult i-User Superposition Transmission) transmission in a wireless communication system.
  • MUST MUST
  • MUST MUST
  • a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described in brief.
  • E—UMTS Evolved Universal Mobile Telecommuni- cation Systems
  • UMTS Universal Mobile Telecommuni- cation Systems
  • LTE Long Term Evolution
  • an E-UMTS is an access gateway located at an end of a user equipment (UE) and a base station (eNode B), an eNB, and an network (E-UTRAN) and connected to an external network; AG)
  • a base station can transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
  • Sal is set to one of the bandwidth of 1.25, 2.5, 5, 10, 15, 20Mhz, etc. to provide downlink or uplink transmission service to multiple terminals. Different cells can be configured to provide different bandwidths.
  • the base station controls data transmission and reception for a plurality of terminals.
  • For downlink (DL) data the base station transmits downlink scheduling information to relate to time / frequency domain, encoding, data size, and HARQ (hybr id a repeat repeat and reQuest) to which data is transmitted to the corresponding UE. Give information and more.
  • the base station transmits uplink scheduling information to the corresponding terminal for uplink (UL) data and informs the user equipment of time / frequency domain, encoding, data size, HARQ related information, etc. available for the corresponding terminal.
  • An interface for transmitting user traffic or control traffic may be used between base stations.
  • the core network (CN) may consist of an AG and a network node for user registration of the terminal.
  • the AG manages the mobility of the UE in units of a TACTrackng Area) composed of a plurality of cells.
  • a method for receiving a downlink data signal from a base station by a terminal includes: receiving downlink control information including a field relating to an interference signal; And receiving the downlink data signal using the downlink control information, wherein the field about the interference signal indicates whether the interference signal exists, and when the interference signal exists, the interference
  • the field relating to the signal is further characterized by a modulation scheme applied to the interfering signal.
  • a terminal in a wireless communication system which is an aspect of the present invention includes a wireless communication module; And a processor connected to the wireless communication modules and receiving downlink control information including a field relating to an interference signal, and receiving a downlink data signal using the downlink control information.
  • Field indicates whether the interference signal exists, and when the interference signal exists, the field relating to the interference signal further indicates a modulation scheme applied to the interference signal.
  • the field relating to the interference signal further indicates whether the modulation order of the modulation scheme applied to the interference signal is greater than or equal to a specific value.
  • the field related to the interference signal is a modulation technique applied to the interference signal and includes one of quadrature phase shift keying (QPSK), quadrature amplitude modulation (16QAM), and 64QAM. It is characterized by indicating.
  • QPSK quadrature phase shift keying
  • 16QAM quadrature amplitude modulation
  • 64QAM 64QAM
  • the field relating to the interference signal is two bits in size, one state of the field relating to the interference signal indicates the absence of the interference signal, and the remaining three states of the field relating to the interference signal. Each of which indicates the presence of the interference signal and a modulation technique applied to the interference signal.
  • the interference signal is a downlink data signal of another terminal multiplexed with the downlink data signal.
  • the other terminal may be a remote terminal located at the coverage boundary of the base station.
  • a base station in a wireless communication system, can efficiently provide control information to a terminal for MUST transmission.
  • FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system. Drawing.
  • FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
  • FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
  • FIG. 5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
  • FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system. ⁇
  • Figure 7 is an example of one of the transmission schemes of the MUST system.
  • FIG. 8 is a diagram illustrating various options for indicating presence or absence of MUST interference according to an embodiment of the present invention.
  • FIG 9 illustrates a configuration of a DCI field according to an embodiment of the present invention.
  • FIG. 10 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, but this is an example and the embodiment of the present invention can be applied to any communication system corresponding to the above definition.
  • the present specification describes an embodiment of the present invention on the basis of the FDD scheme, but this is an exemplary embodiment of the present invention can be easily modified and applied to the H-FDD scheme or the TDD scheme.
  • FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
  • the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
  • the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
  • the physical layer is connected to the upper layer of the medium access control link through a transport channel. Data moves between the medium access control layer and the physical layer through the transport channel. Data moves between the physical layer between the transmitting side and the receiving side through the physical channel.
  • the physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in the Orthogonal Frequency Division Multiple Access (0FDMA) scheme in the downlink, and modulated in the Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in the uplink.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
  • RLC radio link control
  • the RLC layer of the second layer supports reliable data transmission.
  • the function of the RLC layer may be implemented as a functional block inside the MAC.
  • the two-layer Packet Data Convergence Protocol (PDCP) layer performs header compression to reduce unnecessary control information for efficient transmission of IP packets such as IPv4 or IPv6 over narrow bandwidth interfaces. do.
  • PDCP Packet Data Convergence Protocol
  • the radio resource control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
  • the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in association with configuration, reconfiguration (reconfiguration), and release of radio bearers (RBs).
  • RB means a service provided by the second layer for data transmission between the terminal and the network.
  • the RRC layers of the network exchange RRC messages with each other. When there is an RRC connected (RRC Connected) between the UE and the RRC layer of the network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode.
  • the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
  • One cell constituting the base station is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz to provide downlink or uplink transmission services to various terminals. Different cells may be configured to provide different bandwidths.
  • a downlink transport channel for transmitting data from a network to a UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting user traffic or a control message. ). Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
  • BCH broadcast channel
  • PCH paging channel
  • SCH downlink shared channel
  • the logical channel mapped to the transport channel which is mapped to the transport channel, is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a muul (MTCH).
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH muul
  • FIG. 3 is a diagram for describing physical channels used in a 3GPP system and a general signal transmission method using the same.
  • the terminal performs an initial cell search operation such as synchronizing with the base station (S301).
  • the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (Schron SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID. have.
  • the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal refers to downlink in the initial cell search step
  • the downlink channel state may be checked by receiving a signal (Downlink Reference Signal; DL RS).
  • DL RS Downlink Reference Signal
  • the UE which has completed the initial cell search receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information carried on the PDCCH, thereby providing a more specific system.
  • Information can be obtained (S302).
  • the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
  • RACH random access procedure
  • the UE may transmit a specific sequence to the preamble through a physical random access channel (PRACH) (S303 and S305), and may receive a response message for the preamble through the PDCCH and the Daesung PDSCH ( S304 and S306).
  • PRACH physical random access channel
  • a contention resolution procedure may be additionally performed.
  • the UE After performing the above-described procedure, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel as a general uplink / downlink preferred transmission procedure.
  • Physical Uplink Control Channel (PUCCH) transmission (S308) may be performed.
  • the terminal receives downlink control information (DCI) through the PDCCH.
  • DCI downlink control information
  • the DCI includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.
  • the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station is a downlink / uplink ACK / NACK signal, CQK Channel Quality Indicator), ⁇ (Precoding Matrix Index), RKRank Indicator ), And the like.
  • the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.
  • FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
  • a radio frame has a length of 10 ms (327200 x T s ) and is composed of 10 equally sized subframes.
  • Each The subframe has a length of lms and consists of two slots.
  • Each slot has a length of 0.51113 (15360> ⁇ 1 ⁇ ).
  • the slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • one resource block includes 12 subcarriers X 7 (6) OFDM symbols.
  • TTK Transmission Time Interval which is a unit time for transmitting data, may be determined in units of one or more subframes.
  • the structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may be variously changed.
  • FIG. 5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
  • a subframe consists of 14 OFDM symbols.
  • the first 1 to 3 OFDM symbols are used as the control region and the remaining 13-11 OFDM symbols are used as the data region.
  • R1 to R4 represent reference signals (RS) or pilot signals for antennas 0 to 3.
  • the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
  • the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
  • Control channels allocated to the control region include a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid-ARQ Indicator CHannel (PHICH), and a Physical Cal Downlink Control CHannel (PDCCH).
  • PCFICH Physical Control Format Indicator CHannel
  • PHICH Physical Hybrid-ARQ Indicator CHannel
  • PDCCH Physical Cal Downlink Control CHannel
  • the PCFICH is a physical control format indicator channel and informs the UE of the number of OFDM symbols used for the PDCCH in every subframe.
  • the PCFICH is located in the first OFDM symbol and is set in preference to the PHICH and PDCCH.
  • the PCFICH is composed of four Resource Element Groups (REGs), and each REG is distributed in the control region based on the cell HXCell IDenti.ty.
  • One REG is composed of four resource elements (REs).
  • RE represents a minimum physical resource defined by one subcarrier and one 0FOM symbol.
  • the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).
  • QPSK Quadrature Phase Shift Keying
  • PHICH is a physical HARQ Hybrid-Automatic Repeat and request (EIQ) indicator channel and used to carry HARQ ACK / NACK for uplink transmission. That is, PHICH represents a channel through which DL ACK / NACK information for UL HARQ is transmitted.
  • the PHICH consists of one REG and is scrambled to be cell-specific.
  • ACK / NACK is indicated by 1 bit and modulated by BPSl binary phase shift keying.
  • SF Spreading Factor
  • a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
  • the number of PHICHs multiplexed into the PHICH group is determined according to the number of spreading codes.
  • the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
  • the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe, where n is indicated by the PCFICH as an integer of 1 or more.
  • the PDCCH consists of one or more CCEs.
  • the PDCCH informs each UE or UE group of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information.
  • PCH paging channel
  • DL-SCH downlink-shared channel
  • Paging channel (PCH) and down 1 ink-shared channel (DL-SCH) are transmitted through PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
  • Data of PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode PDSCH data is included in the PDCCH and transmitted.
  • a specific PDCCH is CRC masked with an RNTI (Radio Network Temporary Identity) of " ⁇ ", and a radio resource (eg, frequency location) of " ⁇ ""and a DCI format of" i ", that is, transmission format information.
  • RNTI Radio Network Temporary Identity
  • a radio resource eg, frequency location
  • FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
  • the uplink subframe may be divided into a region to which a Physical Uplink Control CHannel (PUCCH) carrying control information is allocated and a region to which a Physical Uplink Shared CHannel (PUSCH) carrying user data is allocated.
  • the middle part of the subframe is allocated to the PUSCH, and both parts of the data area are allocated to the PUCCH in the frequency domain.
  • the control information transmitted on the PUCCH includes ACK / NACK used for HARQ, Channel Quality Indicator (CQI) indicating downlink channel status, RI (Rank Indicator) for ⁇ , Sl Scheduling Request, which is an uplink resource allocation request, and the like. There is this.
  • the PUCCH for one UE uses one resource block occupying a different frequency in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are frequency hoped at the slot boundary.
  • MIM0 Multi pie-Input Multiple—Output
  • MIM0 is a method of using a plurality of transmit antennas and a plurality of receive antennas, and this method can improve data transmission and reception efficiency. That is, by using a plurality of antennas at the transmitting end or the receiving end of the wireless communication system, the capacity can be increased and the performance can be improved.
  • MIM0 may be referred to as 'multi antenna 1 '.
  • the multi-antenna technique does not rely on a single antenna path to receive one entire message. Instead, in multi-antenna technology, data fragments received from multiple antennas are gathered and merged to complete the data. Using multi-antenna technology, the data rate can It is possible to improve system coverage while improving or guaranteeing a specific data transmission rate. In addition, this technique can be widely used in mobile communication terminals and repeaters. According to the multiple antenna technology, it is possible to overcome the transmission limit in the mobile communication according to the prior art, which used a single antenna.
  • the transmitting end is provided with ⁇ ⁇ transmitting antennas and the receiving end is provided with N R antennas
  • the plurality of antennas may be used at either the transmitting end or the receiving end.
  • the theoretical channel transmission capacity is increased than when using.
  • the increase in channel transmission capacity is proportional to the number of antennas. Therefore, the transmission rate is improved and the frequency efficiency is improved.
  • the maximum transmission rate in the case of using one antenna is R 0
  • the transmission rate in the case of using the multiple antennas has a rate increase rate of 1 ⁇ at the maximum transmission rate R 0 .
  • ⁇ is the smaller of ⁇ ⁇ and N R. For example, in a MIM0 communication system using four transmit antennas and four receive antennas, it is theoretically possible to obtain a transmission rate four times higher than that of a single antenna system.
  • the research trends related to multi-antennas to date include information theory aspects related to calculation of multi-antenna communication capacity in various channel environments and multi-access environments, research on wireless channel measurement and model derivation, and transmission reliability improvement of multi-antenna systems.
  • Active research is being conducted from various viewpoints, such as research on space-time signal processing technology for improving data rate.
  • each of the different information sent using the multi-antenna technique is defined as a 'stream' or simply 'stream'
  • the present invention relates to signaling and detailed operations required in an interference cancellation receiver of a MUST (Multi-User Superposition Transmission) system.
  • MUST MUST basically transmits a signal to an interference canceling receiver
  • a plurality of UEs are allocated to the same frequency-time resource using a previously considered power ratio, compared to a method of allocating resources in the frequency-time domain in the existing 0FDMA system.
  • a multi-access scheme that can obtain a large bandwidth efficiency is considered as an important candidate technology of a 5G system in the future.
  • the one spatial layer includes a plurality of data to which the same precoding vector or the same diversity scheme is applied.
  • Layers may be configured to overlap. These overlapping data layers may be divided based on power differences.
  • the two UEs scheduled together, preferably a near UE, may distinguish their data in the one spatial layer by using a power difference.
  • the critical configuration technology of the MUST system can be largely divided into a resource allocation scheme of a base station and an interference cancellation scheme of a terminal.
  • the symbol level interference cancellation (SIC) receiver represented by the ML (Maximum likelihood) receiver, the L-CWIC (MMSE based Linear CWIC), ML-CWIC, etc.
  • Codeword level interference " cancellation" (CWIC) receivers can be distinguished. Receive gain varies in a given environment according to each interference cancellation scheme. In general, the ML technique is applied in proportion to the UE implementation complexity. The gain of the CWIC type receiver is large.
  • Downlink data for a plurality of UEs is transmitted at the same time and at the same frequency through a MUST transmission scheme.
  • the near-UE Near UE
  • the far-away UE Far from the eNB UE
  • the far UE of the near UE Although there is some interference from the data, the transmission power carried in the near-field UE data is much weaker than its own data power, and the magnitude of the interference is reduced due to the high path loss. Data can be received without advanced IC (interference cancellation) such as ion (IM) / ML (Maximum 1 ikel ihood) / CWIC (Codeword level interference Cancel lat ion).
  • IM ion
  • ML Maximum 1 ikel ihood
  • CWIC Codeword level interference Cancel lat ion
  • the near-field UE is subject to large interference from the far-field UE, thereby mitigating interference and receiving data using ICs such as SUC / ML / CWIC.
  • MUST systems they exist in various transmission schemes. 7 is an example of one of the transmission schemes of a MUST system.
  • information bits which are data of a short-range UE, and information bits, which are data of a far-field UE, are converted into coded bits through respective channel coding. Thereafter, the code bits of each UE are passed through the modulator to generate constellation symbols of the near and far UEs, respectively. After that, the power is properly allocated to each constellation symbol, and then the two constellation symbols are combined into a superposed symbol.
  • the sign bit of a near field UE and a far field UE Assuming that the sign bits are 00 and 11, respectively, a constellation symbol of each UE is generated and power is allocated through QPSK modulation. Then, two QPSK symbols are combined to generate one overlapping symbol. One superimposed symbol thus generated is illustrated in the right figure of FIG. 7, and the enhancement symbol is transmitted through the base station antenna through layer mapping and precoding.
  • MUST UE which MUST be a high geometry UE or a low geometry UE
  • MUST UE may have its own data.
  • predetermined assistance information asss i st ance i nf ormat i on
  • Has been discussed an example of which is shown in Table 2 below.
  • potentiaJ PDSCH assistance information for MUST Category 1, 2 and 3 UE.
  • -PDSCH RE mapping information of MUST paired UE if it is different from its own PDSCH RE mapping infoniiation, e.g. PDSCH starting symbol or PDSCH RE mapping at
  • Transmission scheme of MUST paired UE if mixed transmission schemes, e.g. transmit diversity and closed-loop spatial multiplexing
  • the base station selects a specific CRC.
  • the DCI is transmitted using masking, and the UE proposes an operation of performing a CRC check using the CRC masking.
  • the UE proposes an operation of performing a CRC check using the CRC masking.
  • the CRC bit of the DCI is generated and masked through the UE_ID assigned to the UE by the base station, and the masked CRC is transmitted through the CRC field of the DCI.
  • UE knows its UE_ID Therefore, the CRC check is performed using the UELID and the received DCI.
  • the base station informs the terminal of the presence or absence of MUST interference
  • the CRC of the DCI is CRC masked with the UE ID, it may indicate that the MUST interference exists, and if the CRC is masked with the VID MUST indicate that no interference exists.
  • FIG. 8 illustrates various options for indicating presence or absence of MUST interference according to an embodiment of the present invention.
  • FIG. An operation of a specific UE for each option will be described with reference to FIG. 8.
  • option 1 indicates the presence or absence of MUST interference by using CRC masking as described above
  • DCI is CRC masked with UE_ID
  • MUST interference is present, so the UE uses the added assistance information field in DCI.
  • the UE uses the added assistance information field in DCI.
  • the UE considers the added assistance information field in the DCI as a dummy bit (dummy b i t s) and ignores it.
  • option 2 indicates CR presence by using CRC masking as described above
  • DCI is CRC masked by UE_ID
  • the UE transfers some fields of DCI to the assistance information field. It is determined that it has been overridden in order to perform interference cancellation of another UE using the corresponding assistance information field.
  • the UE assumes that some fields of the DCI are legacy DCIs that are not overridden for the delivery of the Assistance Information field.
  • option 3 indicates the presence or absence of MUST interference using CRC masking as described above
  • DCI when DCI is CRC masked with UELID, there is MUST interference, so the UE includes assistance information in addition to legacy DCI.
  • the DCI is blindly detected and interference cancellation of another UE is performed using the corresponding assistance information.
  • the UE does not attempt blind detection for the new DCI containing the assistance information.
  • CRC masking is used to indicate the presence of MUST interference.
  • DCI is CRC masked with UE 'ID
  • MUST interference exists so that the UE blindly detects the DCI of another UE that contains assistance information in addition to the legacy DCI and removes interference of another UE by using the assistance information. Perform.
  • the DCI is CRC masked with the VID, since there is no MUST interference, the UE does not attempt blind detection with respect to the DCI of another UE that contains the assistance information.
  • the UE interprets the DCI according to the presence or absence of assistance information. Whether the individual DCI attempts blind detection may be as described above.
  • the assistance information has been added to and expanded from the legacy DCI in options 1 and 4 (ie, some fields for the assistance information are added after the legacy DCI). If there is no MUST interference, the information is filled with dummy data. In this case, in order to increase the reliability of DCI decoding (re l i abi l i ty), the dummy data is filled with a specific value promised by the base station and the UE, for example, zero padding.
  • the base station and the UE are UE_ID, VID1, VID2,... , VID N is known (VID is defined UE-specific and other UE It must be uniquely defined for each UE so that DCI blind detection irrelevant to itself is not successful.)
  • Each CRC masking candidate that is, UE_ID, VID1, VID2, ... VID N may indicate specific assistance information.
  • UE_ID, VID1, VID2,... , VIDN can be mapped 1: 1 with different power allocation ratio information.
  • UE_ID, VID1, VID2, ..., and VID N may each be mapped 1: 1 with DM-RS information (VCID, nSCID, DM-RS port, number of layers, etc.) or modulation order information of different MUST-pair UEs. have.
  • This mapping relationship may be fixedly defined, but the base station may inform the UE through RRC signaling.
  • the VID may inform the UE specifically of the UE through RRC signaling or the like.
  • the UE—the VID may be generated and used using a method or a function promised by the base station and the UE based on the ID.
  • the VID may be defined by adding an offset to the UE—ID using a predetermined offset value or by using a bit operation of the UE ID and the offset, for example, an X0R operation.
  • VID may be generated and used by using UE_ID as a parameter of a specific function.
  • the assistance information required for each case may be different, and thus, the signaling payload size and blind detection calculation amount of the assistance information may vary.
  • modulation order information of the interfering UE is required.
  • the MUST case should be signaled to the UE during the MUST transmission or the UE should be able to detect the blind.
  • the proposed CRC masking can be used to inform. If the transmission scheme for the intention data of the UE is transmission reversibility (TxD), it is automatically applied to case 2, so that separate signaling for case 2 is performed. It is unnecessary. However, for other transmission schemes, as in case 1 in subframe #N and case 3 in subframe ⁇ +1, one of case 1 and case 3 can be applied dynamically. It may be defined as assistance information.
  • case 1 and case 3 require different assistance information payload sizes
  • UE complexity may be increased by increasing the number of DCI blind detections of the UE.
  • case 1 and case 3 may have a total of 4 bits and 3 bits of assistance information fields, respectively.
  • the UE since the total DCI payload sizes for Case 1 and Case 3 are different, the UE should perform DCI blind detection for DCI assuming Case 1 and DCI assuming Case 3, respectively. Therefore, in order to prevent an increase in the number of DCI blind detections, it is necessary to fix the size of the DCI containing MUST assistance information regardless of the case.
  • the case of the case 1 and case 3 of the assistance information payload size is large, the assistance information payload size is fixed, and if the case 3 is applicable, the remaining unnecessary assistance information fields are stored as dummy data. I can send it.
  • the base station and the UE may always promise the dummy data to all zero values.
  • the base station may set the UE to the UE through higher layer signaling so that case 1 or case 3 may be selected and applied semi-statically (sem i -st at i c). It can also inform case information with MUST presence of interference. That is, the existence of MUST interference for case 1 and the existence of MUST interference for case 3 are defined separately, and the base station distinguishes and informs the UE of this. If there is a MUST interference present for Case 1, the UE interprets the remaining —Assist Information field as the required information field in Case 1, and if there is a MUST interference for Case 3, the UE interprets the remaining Assist Information field. Interpret it as an information field.
  • case 1 If there is a MUST interference corresponding to case 1, the assistance information fields for case 1 are interpreted as valid but otherwise the assistance information fields are interpreted as dummy signals rather than being interpreted as valid. Similarly, the same applies to case 3.
  • Some information in the assistance information set for the case 1 and the case 3 may not need to be signaled as the UE detects the blind.
  • the UE may perform blind detection within the several values.
  • the UE After the UE detects or signals the case 1 and the case 3 blindly, the UE differs in interpretation of the remaining assistance information or in a blind detection target according to the result.
  • field interpretation of DCI varies according to Case 1 and Case 3 as follows.
  • Case 1 the presence of interference is defined by 1 bit and the power allocation information is defined by 2 bits for the first and second layers, respectively, and a total of 4 bits of assistance information fields are defined.
  • case 3 a total of 4 bits of assistance information fields are defined as 1 bit of RI, 2 bits of PMI, and 1 bit of modulation order.
  • signaling is limited only to QPSK and 16QAM.
  • the modulation technique of the actual interference is 64QA
  • performance degradation is not expected to be significant, instead of signaling 64QAM, instead of signaling 16QAM. For this reason, it is helpful to save control signal by limiting the modulation order to only 1 bit signaling without QPSK and 16QAM. .
  • the assistance information field may be defined as 1 bit, 2 bits by combining RI and PMI and 1 bit of modulation order.
  • RI and PMI 1 bit of modulation order.
  • a combination of RI and ⁇ of two UEs corresponding to case 3 is as follows. In particular, while simultaneously signaling the tank and ⁇ of the interfering UE, it is assumed that the UE to remove the interference and the interfering UE receive data through different categories.
  • ⁇ of the UE to remove the interference are defined as State 0, State 1, or State 2 because they are one of the other three).
  • the PMI of the UE to remove the interference is indicated by DCI and the PMI of the interfering UE does not include the PMI of the UE to remove the interference. Since there is only one rank 2 PMI, it is defined as state 3.
  • the rank of the UE to remove interference 2
  • the rank of the interfering UE 1: the PMI of the UE to remove the interference is indicated by DCI and the PMI of the interfering UE to the two vectors of the PMI of the UE to remove the interference Since it is one of the two remaining except, it is defined as state 4, state 5.
  • an interfering RI and a PMI may be signaled.
  • the RI of the interference is signaled and the PMI allows the UE to detect blind.
  • the near UE among the MUST pair UEs informs the MUST of the interference and informs the remote UE that the MUST does not exist.
  • the far-field UE treats the assistance information field as dummy data and operates in the same manner as the reception operation in non-MUST transmission.
  • the base station should inform the UE whether it is scheduled as a far-end UE or an existing MIM0 transmission scheme.
  • the UE inform the UE that there is no MUST interference, and additionally. At this time, the UE signals whether it is scheduled as a MUST remote UE or an existing MIM0 transmission scheme.
  • the UE receives and uses additional assistance information for removing near-field UE interference in the assistance information field. For example, it receives power allocation ratio information and uses it to calculate SE-IRC received beamforming.
  • the UE treats the assistance information field as dummy data. It is possible to indicate whether the UE is a remote UE through information on the existing MIM0 transmit power allocation ratio. That is, the UE signals that there is no MUST interference, and signals one of 0, 0.1, and 0.2 as power allocation ratio information. A value of 0 means near
  • the UE Since the power of the UE is 0, the UE is scheduled by the existing MIM0 transmission scheme. If the value is 0.1 (or 0.2) then the UE is a far-field UE and assumes the power of the near-field UE to be 0.1 (or 0.2) of the total received power to eliminate interference from the near-field UE.
  • a UE using an ML receiver constructs a composite constel lat ion (i.e., overlaps) using its intended symbol and interference symbol, and then decodes it by comparing with a received signal. Do this.
  • the more the number of symbols constituting the combined constellation the more complicated the decoding.
  • the number of symbols increases as the number of overlapping layers and the modulation order for each layer increase. Therefore, if the interference modulation order is small, ML decoding can be performed for more interference layers. For example, if the interference uses 64QAM, ML decoding is possible for up to one interference layer, but in the case of QPSK, ML decoding may be performed for up to two interference layers.
  • the MUST UE reports its MUST interference cancellation capability, it is desirable to report the number of interference layers that can be removed differently according to the modulation order of interference.
  • the UE may report that MUST be performed only for a specific case among case 1, case 2, and case 3.
  • MUST UE can be implemented at various levels of terminal complexity, thereby ensuring flexibility of the terminal implementation. For example, if the UE reports that only Case 1 MUST be possible, the implementation complexity is low, and the terminal capable of supporting Case 1, Case 2, and Case 3 has a high implementation complexity.
  • the UE reports to Case 1 and Case 2 whether it is possible to eliminate MUST interference only when it is a near field UE or to remove interference when it is a near / far UE and schedules the latter UE as a far UE.
  • the base station may transmit additional assistance information for eliminating short-range UE interference.
  • the terminal supporting case 3 may report the blind ' detection capability for the interfering DM-RS port in the capability information.
  • the MUST UE reports to the base station whether blind detection is possible for all interfering DM-RS ports 7, 8, 11, and 13 or blind detection is possible only for DM-RS ports 7, 8.
  • the base station can allocate DM-RS ports 11 and 13 as well as DM8 RS ports of the interfering UE. This can increase scheduling freedom.
  • the ability to support blind detection may be defined as an optional feature to reduce the burden of the UE implementation.
  • Case 3 can be defined as an additional feature to reduce the burden on the UE implementation.
  • the UE may inform the UE through a power allocation value without additional signaling. For example, if the signaled or blind detected power allocation ratio values are 0.9 and 0.8, the terminal recognizes itself as a far-field UE.
  • the UE performs demodulation and decoding in the same manner as the existing MIM0 or attempts to remove the near UE interference by using data power information of the near UE.
  • the power allocation ratio is 0.2 Recognizes as a near-field UE and operates as a ML to remove interference from the far-field UE. If 0, it recognizes as a MIMO UE and performs demodulation and decoding.
  • a remote UE is limited to the QPSK modulation technique is QPSK, so, the data is carried on the phase (phase), not demodulate the data using power directly. That is, the data power may be arbitrarily set regardless of the PA and PB values.
  • the data power should still be set according to the PA and PB values. That is, the data power is set to a scaled power value using PA and PB for the received CRS power.
  • the data power of the far UE and the data power of the near UE should be determined as follows.
  • the near UE needs to know ⁇ beep and al pha to calculate the data power of the far UE.
  • Al pha is a power allocation ratio value that the base station can inform or blind detection the UE. Since P A is an RRC signaled value differently for each UE, it may change when another far-field UE is paired, and the far-field UE to be paired may change dynamically in subframe units. To this end, the base station may dynamically inform the short-range UE of the P A _ f arUE through the DCI, but the signaling overhead may be large, so the base station primarily transmits the P A ⁇ f to the UE through higher layer signaling such as RRC signaling.
  • a set of arUEs can be informed and a PA value used within a predetermined set can be designated through DCI.
  • the near-field UE assumes that the PA value set to it and the P A _ f arUE value are the same, and the base station may ensure this condition at the time of scheduling.
  • a UE supporting MUST transmission rather than a legacy UE if the UE receives QPSK data, it may be limited to not setting data power by applying PA / PB even if the volume is set to 2 or more. have.
  • the UE indicates to its scheduled RBs. Assume that interference exists uniformly.
  • the base station informs the UE of MUST interference information through the DCI, it is preferable to inform each RB in terms of scheduling freedom, but the DCI overhead is increased.
  • the present invention proposes to inform the interference information for each subband which is a larger unit.
  • the base station may inform the UE of a resource unit (ie, an RB unit, a subband unit, or an overall bandwidth unit) that informs the interference information, and may give the interference information through the DCI according to the unit.
  • the base station may determine a resource unit of the interference information and inform the UE in consideration of a trade-off between DCI overhead and scheduling degrees of freedom.
  • the DCI field may be configured as shown in FIG. 9.
  • the NK bit DCI field may be applied to all of the options 1 to 4 above.
  • a new DCI is generated by extending an existing DCI and appended with an NK bit DCI field.
  • the NK bit DCI is defined as a single DCI.
  • the UE can know the existence of the interference and the interference channel through the blind detection of the interference DM-RS port and the sequence. If its DM-RS bundling is turned on, it is assumed that the interfering PDSCH is bundled in the same RB unit as its DM-RS bundling, and scheduling information of the interfering PDSCH (ie, interference modulation order, interfering DM-RS port, DM— RS sequence, etc.) are detected blindly in bundling units.
  • the base station may inform the UE of the presence of interference DM-RS bundling and the RB unit.
  • the base station may signal to the UE whether or not the interference PDSCH is bundled—in RB units equal to its DM-RS bundling—assuming it may be bundled.
  • MUST UE needs to know the modulation order of the interference data.
  • interference data may vary from B to B, it is necessary to know the modulation order for each RB, but this increases signaling overhead.
  • RBs with interfering data can always be limited to the same modulation order (ie, single modulation order) to reduce signaling overhead. Accordingly, rather than signaling the interference modulation order by RB, it is assumed that the signal is transmitted as one value, and the UE assumes that interference data is transmitted to all of its scheduled RBs in the signaled modulation order.
  • MUST UE can determine the presence of interference for each RB, it is assumed that interference data is transmitted in the signaled modulation order for all RBs in which interference exists. This approach reduces signaling overhead but introduces scheduling constraints on interfering data.
  • the present invention proposes that the interference modulation order is signaled as one value according to the modulation order of the MUST UE, or the UE directly detects and finds the blind.
  • a MUST UE has a low modulation order, such as QPSK (in modulation order for its PDSCH), its four constellation points (cons tell at i on po i nt s) are relatively high. It is possible to blindly detect the interference modulation order with accuracy, whereas the blind detection accuracy drops significantly when the MUST UE is 64QAM. Therefore, when the modulation order of MUST UE is less than a specific modulation order, it is preferable that the UE detects the blind without signaling, and if it is more than the specific modulation order, it is preferable to signal. However, when signaling, it is preferable to indicate only one single modulation order value in consideration of overhead.
  • the specific modulation order may be QPSK or 16QAM.
  • the UE when the DCI format and payload size of the DCI through which the assistance information is transmitted are changed according to the modulation order of MUST UE, the number of DCI blind detections increases. In order to prevent this, there should always be a field for transmitting the modulation order of interference in the DCI to which the assistance information is transmitted, and the UE does not interpret the field as a dummy signal when its modulation order is less than or equal to a specific modulation order. If more than a specific modulation order, the field is interpreted and assumed as a single modulation order of the interference data. Alternatively, if a modulation order of MUST UE is less than or equal to a specific modulation order, the field may be reused for other assistance information transmission.
  • the MUST UE needs to know the modulation order of the interference data.
  • the base station may provide the modulation order information for the interference data, for example, the PDSCH of the far UE through RRC signaling or the like for this purpose.
  • joint encoding may provide information on whether there is a MUST interference and, if present, the modulation order, and an example thereof is shown in Table 5 below.
  • the base station may indicate one of the states of Table 5 to the MUST UE by using a 2-bit field on DCI format 2B / 2C / 2D.
  • the MUST UE can determine the presence or absence of MUST interference, and if there is a MUST interference, it can determine the modulation order of the corresponding signal and can be used as useful information for interference cancellation.
  • FIG. 10 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • the communication apparatus 1000 includes a processor 1010, a memory 1020, an RF module 1030, a display module 1040, and a user interface module 1050.
  • the communication apparatus 1000 is shown for convenience of description and some models may be omitted. In addition, the communication apparatus 1000 may further include necessary modules. In addition, some of the hairs in the communication device 1000 may be classified into more granular hairs.
  • the processor 1010 is configured to perform an operation according to an embodiment of the present invention illustrated with reference to the drawings. In detail, the detailed operation of the processor 1010 may refer to the contents described with reference to FIGS. 1 to 9.
  • the memory 1020 is connected to the processor 1010 and stores an operating system, an application, a program code, data, and the like.
  • the RF modules 1030 are connected to the processor 1010 and convert the baseband signals into radio signals or convert radio signals. Converts to baseband signal. For this purpose, the RF modules 1030 perform analog conversion, amplification, filtering and frequency up conversion or their reverse processes.
  • the display modules 1040 are connected to the processor 1010 and display various information.
  • the display modules 1040 may use well known elements such as, but not limited to, LCD Liquid Crystal Display (LED), LED Light Emitting Diode (0LED), and 0rganic Light Emitting Diode (0LED).
  • the user interface models 1050 are connected to the processor 1010 and can be configured with a combination of well known user interfaces such as a keypad, touch screen, and the like.
  • the specific operation described as performed by the base station in this document may be performed by an upper node in some cases. That is, it is apparent that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • Embodiments may be implemented by various means, such as hardware, firmware, software or combinations thereof.
  • one embodiment of the present invention may include one or more applicat ion specific integrated circuits (ASICs) and digital signals (DSPs).
  • processors may include digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and processors . It may be implemented by a controller, a micro controller, a micro processor, or the like.
  • an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
  • Transceivers (AREA)

Abstract

L'invention concerne un procédé de réception d'un signal de données de liaison descendante, d'un nœud B évolué (eNB), par un équipement d'utilisateur, dans un système de communications sans fil. Plus précisément, le procédé comprend les étapes consistant à : recevoir des informations de commande de liaison descendante comprenant un champ lié à un signal d'interférence ; et recevoir le signal de données de liaison descendante à l'aide des informations de commande de liaison descendante, le champ lié au signal d'interférence indiquant l'existence éventuelle d'un signal d'interférence, et indiquant en outre un schéma de modulation appliqué au signal d'interférence lorsque le signal d'interférence existe.
PCT/KR2017/005015 2016-05-13 2017-05-15 Procédé de transmission d'informations de commande pour une transmission must dans un système de communications sans fil, et appareil associé Ceased WO2017196155A2 (fr)

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US16/094,868 US10993214B2 (en) 2016-05-13 2017-05-15 Method for providing control information for must transmission in wireless communication system, and apparatus therefor
EP17796455.8A EP3457597A4 (fr) 2016-05-13 2017-05-15 Procédé de transmission d'informations de commande pour une transmission must dans un système de communications sans fil, et appareil associé

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US201662335713P 2016-05-13 2016-05-13
US62/335,713 2016-05-13
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US201662369762P 2016-08-02 2016-08-02
US62/369,762 2016-08-02
US201662373968P 2016-08-11 2016-08-11
US62/373,968 2016-08-11
US201662401869P 2016-09-29 2016-09-29
US62/401,869 2016-09-29
US201662405255P 2016-10-07 2016-10-07
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JP2020017779A (ja) * 2016-11-02 2020-01-30 株式会社Ｎｔｔドコモ ユーザ装置、及び信号受信方法
US11533155B2 (en) * 2019-06-07 2022-12-20 Qualcomm Incorporated Triggering demodulation reference signal bundling
CN118523803A (zh) * 2023-02-17 2024-08-20 华为技术有限公司 通信方法及装置
WO2025034969A1 (fr) * 2023-08-09 2025-02-13 Apple Inc. Assistance de réseau pour récepteur avancé mu-mimo

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WO2013191367A1 (fr) * 2012-06-18 2013-12-27 엘지전자 주식회사 Procédé d'émission/réception de signal et appareil associé
KR102018316B1 (ko) 2013-02-28 2019-09-05 삼성전자 주식회사 무선 통신 시스템에서 간섭 측정을 위한 제어정보의 전송 방법 및 장치
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EP3457597A4 (fr) 2020-01-08
US10993214B2 (en) 2021-04-27
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US20190098610A1 (en) 2019-03-28
WO2017196155A3 (fr) 2018-08-09

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